Flowmeter Selection: positive_displacement
Flowmeter selection guide covering 16 meter types across 6 categories (differential_pressure, velocity, mass_flow, electromagnetic, positive_displacement, variable_area, open_channel) — each record documents accuracy (% reading or full-scale), rangeability, pressure drop class, fluid compatibility, installation straight-run requirements, and relative cost class
| meter category | meter type | accuracy basis | accuracy pct reading (%) | cost class | cost relative | downstream diameters max | downstream diameters min (pipe_diameters) | fluid compatibility | fluid phase | fluid restrictions | installation notes | measurement principle | moving parts | notes | pressure drop class | pressure drop notes | rangeability | rangeability num | requires power | temp limit C max (degC) | temp limit C min (degC) | typical applications | typical pipe size in max (in) | typical pipe size in min (in) | upstream diameters max (pipe_diameters) | upstream diameters min (pipe_diameters) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| positive_displacement | positive_displacement | percent_of_reading | 0.1 | medium | 3 | 2 | 2 | Clean viscous liquids - lubricating oils, solvents, fuels, polymers | liquid | Slurries and particulates damage precision internals; high pressure drop at low viscosity | In-line flanged; upstream strainer mandatory; bi-directional versions available | Precisely calibrated volumes swept by gears, lobes, pistons, or vanes | yes | OIML R 117; oval gear, lobed impeller, nutating disk, oscillating piston variants; excellent at low flow | medium | 3 to 8 pct of line pressure through meter body | 10:1 | 10 | yes | 150 | -40 | Custody transfer fuel or oil, chemical dosing, high-viscosity polymer, paint, resins | 6 | 0.25 | 5 | 2 |
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